The unicode property indicates whether or not the u flag is used with a regular expression. unicode is a read-only property of an individual regular expression instance.

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Property attributes of RegExp.prototype.unicode
Writable no
Enumerable no
Configurable yes


The value of unicode is a Boolean and true if the u flag was used; otherwise false. The u flag enables various Unicode-related features. With the "u" flag, any Unicode code point escapes will be interpreted as such, for example.

You cannot change this property directly. It is read-only.


Using the unicode property

const regex = new RegExp('\u{61}', 'u');

console.log(regex.unicode); // true


ECMAScript Language Specification
# sec-get-regexp.prototype.unicode

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See also